For what it's worth my 6AL MSD box (nothing special) has been pushing spark through a stock distributor and cheap Summit wires through e85 and 20+psi of boost for 6 years now.
Don't get too hung up on the decision.
If it were up to me out of those two I'd pick the fire cores as I know they fit good and Rick seems to stand behind his product.
But if it were me, I'd save the $50 and buy the summit ones.
